These warriors were ceremonially pure (not … defiled) and morally blameless.
for they are virgins: Referring to men as virgins is a metaphor for the faithfulness of God’s people. The image might refer to the church as the virgin bride of Christ (see 2 Corinthians 11:2; Ephesians 5:25–27). It also suggests that the church members are like soldiers in a holy war who must abstain from sexual intercourse (see Deuteronomy 23:9–10; 1 Samuel 21:5).
These faithful people are a special offering, literally called firstfruits (see Exodus 13:14–16; 23:19; Leviticus 23:9–14; Numbers 3:40–51; 18:15–20; Luke 2:22–24), who have been purchased for God.
no lie was found in their mouths: John teaches that liars will never enter heaven (Revelation 21:8, 27; 22:15; see also John 8:44). The followers of Jesus speak and live the truth (see also John 8:32; 14:6).